This meeting will last about 1 hour, no more than 2. The meeting will consist of two parts: the demo and the code review.
You will demontrate your working program. The program will implement all the basic functionality. All the parts will be there and integrated together. Some of the more advanced features might be missing and it is OK if there are still some bugs. However, it will need to be roughly operational.
We will also have a code review where each one of the team members will explain to me how their code works and the design decisions they have made thus far. You can aid yourself with UML diagrams of your code.
So, for this meeting you will need to bring: